<!--
 * @Author: HeAo
 * @Date: 2021-09-27 11:27:50
 * @LastEditTime: 2021-09-27 11:47:51
 * @LastEditors: HeAo
 * @Description: 
 * @FilePath: \web2103-2105\web2103code\3-1-ES6\day03\7-防抖.html
 * 别乱动！
-->
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>防抖</title>
</head>

<body>
  <input type="text">
  <script>
    const input = document.querySelector('input')


    input.oninput = debounce(function () {
      console.log(this.value);
    }, 500)

    function debounce(fn, delay) {
      let timer;
      return function () {
        if (timer) {
          clearTimeout(timer)
        }
        timer = setTimeout(() => {
          // console.log(this);
          fn.call(this)
        }, delay)
      }
    }
  </script>
</body>

</html>